396 research outputs found
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Processes shaping the spatial pattern and seasonality of the surface air temperature response to anthropogenic forcing
In the period 1960-2010, the land surface air temperature (SAT) warmed more rapidly over some regions relative to the global mean. Using a set of time-slice experiments, we highlight how different physical processes shape the regional pattern of SAT warming. The results indicate an essential role of anthropogenic forcing in regional SAT changes from the 1970s to 2000s, and show that both surface-atmosphere interactions and large-scale atmospheric circulation changes can shape regional responses to forcing. Single forcing experiments show that an increase in greenhouse gases (GHG) can lead to regional changes in land surface warming in winter (DJF) due to snow-albedo feedbacks, and in summer (JJA) due to soil-moisture and cloud feedbacks. Changes in anthropogenic aerosol and precursor (AA) emissions induce large spatial variations in SAT, characterized by warming over western Europe, Eurasia, and Alaska. In western Europe, SAT warming is stronger in JJA than in DJF due to substantial increases in clear sky shortwave radiation over Europe, associated with decreases in local AA emissions since the 1980s. In Alaska, the amplified SAT warming in DJF is due to increased downward longwave radiation, which is related to increased water vapor and cloud cover. In this case, although the model was able to capture the regional pattern of SAT change, and the associated local processes, it did not simulate all processes and anomalies correctly. For the Alaskan warming, the model is seen to achieve the correct regional response in the context of a wider North Pacific anomaly that is not consistent with observations. This demonstrates the importance of model evaluation that goes beyond the target variable in detection and attribution studies
2002-2003 Mostly Schubert
https://spiral.lynn.edu/conservatory_otherseasonalconcerts/1069/thumbnail.jp
Investigation of the Effects of Solid-State Treatments on the Structure and Mobility of Copper in Zeolites
Zeolites are microporous, aluminosilicate catalysts that play an important role in industrial applications as well as studies for the fundamental understanding of catalysts for emerging reactions of interest. The introduction of aluminum into the zeolite lattice introduces a negative charge on the framework that can be balanced with extra-framework cations. The control of the aluminum distribution and the choice of charge balancing cations allows for the ability to tailor the active sites to facilitate a desired reaction. This research focuses on studying copper active sites in zeolites. Copper oxide was used as a copper precursor to introduce copper ions in zeolites through solid-state ion-exchange (SSIE). Solid-state ion-exchange was studied using both dry air and wet air treatments at elevated temperatures. Three different zeolite topologies were studied: CHA (small pore), ZSM-5 (medium pore), and MOR (large pore). After SSIE, the copper-zeolites were characterized with atomic absorption spectroscopy (AAS) after sodium back exchange to quantify the number of ionic copper species, and temperature programmed desorption (TPD). These characterization techniques were used to understand how many copper ions were mobilized into the zeolites, which are potential active sites in zeolites. Based on current experimental data on Cu-MOR, SSIE using a wet air treatment has a greater impact for mobilizing copper in zeolites compared to a dry air treatment. The same trend is expected to follow on other zeolite topologies, ZSM-5 and CHA, that are still being studied
2002-2003 Philharmonia Orchestra
Program Overture to Oberon / Carl Maria von Weber Viola Concerto / William Walton Laura Wilcox, viola Symphony No. 5 in B-flat Major, op. 100 / Sergei Prokofievhttps://spiral.lynn.edu/conservatory_philharmonia/1112/thumbnail.jp
2002-2003 Music Society of Coral Lakes, Inc. presents Lynn University\u27s Conservatory of Music Philharmonia
Program Overture to Oberon / Carl Maria von Weber Viola Concerto in A Minor / William Walton Laura Wilcox, viola Symphony No. 5 in B-flat, op. 100 / Sergei Prokofievhttps://spiral.lynn.edu/conservatory_philharmonia/1113/thumbnail.jp
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The 2015 European heat wave
Summer 2015 was marked by hot and dry conditions over Central Europe, and significant increases in temperature extremes. Model experiments indicate that high temperatures were caused by a combination of forced responses and internal atmospheric variability. Model simulations suggest that changes in SST/SIE and anthropogenic forcings explain about 2/3 (1.6oC) of the observed warming (2.4oC) and changes in hot temperature extremes over Central Europe relative to 1964-1993. Interestingly, when comparing 2015SST with 2015ALL simulations, the results indicate that the impact of anthropogenic forcings plays the dominant role. About 1/3 (0.8oC) of the observed summer mean warming and changes in hot extremes is not explained by the model mean response and consequently may have resulted from internal variability, principally through physical processes associated with precipitation deficits. Thus our results indicate that anthropogenic forcings set the conditions for the development of the 2015 heatwave in Central Europe, but that internal variability was an important factor in explaining its extreme character
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